Calcis Pond Lime Calculator

Find out exactly how much Calcis liquid lime your water needs — and why.

Your pond

or enter dimensions

Pond shape

Average length

Average width

Average depth ?

Water chemistry

Current total alkalinity

mg/L

I haven't tested it

Target alkalinity

mg/L

Fine-tune for pH & acid loading recommended

The old calculator only did alkalinity arithmetic. These account for the lime consumed neutralizing acidic water and acidic bottom mud.

Current pH (optional)

Low pH means free CO₂ that consumes lime before alkalinity can rise.

Bottom / mud type

Acid loading (for re-treatment estimate)

— × 2.5-gal jugs of Calcis

— gallons total

Estimate only. For low or untested alkalinity, confirm with a water test before dosing. Liming is not permanent — alkalinity declines over time with acid loading.

Want an exact dose? Map your pond with a free MyPond account for precise surface area & volume — and keep this estimate saved to your account.

To raise alkalinity by —	—
To neutralize free CO₂ (low pH)	—
Extra for bottom-mud lime demand	—
Total Calcis	—